Is CVE-2022-26387 in the CISA KEV catalog?

No. CVE-2022-26387 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-26387?

CVE-2022-26387 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2022-26387?

CVE-2022-26387 has an EPSS score of 0.66% (47th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-26387?

Upgrade firefox on debian unstable to 98.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2022-26387

HIGH

7.5

CVSS v3

NVD

Description

When installing an add-on, Firefox verified the signature before prompting the user; but while the user was confirming the prompt, the underlying add-on file could have been modified and Firefox would not have noticed. This vulnerability affects Firefox < 98, Firefox ESR < 91.7, and Thunderbird < 91.7.

CWE-367TOCTOU Race Condition

How to fix

Remediation Available

firefoxDebian

Fixed in:98.0-1CVE-2022-26387

firefoxUbuntu

Fixed in:98.0.1+build2-0ubuntu0.18.04.1USN-5321-2

Fixed in:98.0+build3-0ubuntu0.18.04.2USN-5321-1

Fixed in:98.0.1+build2-0ubuntu0.20.04.1USN-5321-2

Fixed in:98.0+build3-0ubuntu0.20.04.2USN-5321-1

thunderbirdUbuntu

Fixed in:1:91.7.0+build2-0ubuntu0.18.04.1USN-5345-1

Fixed in:1:91.7.0+build2-0ubuntu0.20.04.1USN-5345-1

DeveloperEditionWindows application

Affected:98.0Fixed in:98.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:98.0Fixed in:98.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:91.7Fixed in:91.7Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.7Fixed in:91.7Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.66%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Exploit1

bugzilla.mozilla.org

Vendor Advisory3

Related Vulnerabilities

Other CWE-367 (TOCTOU Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2022-36980	High	8.1	83%	-	Fix
CVE-2024-30088	High	7.0	68%	KEV + Ransom	Fix
CVE-2004-0594	Medium	5.1	55%	-	Fix
CVE-2024-50379	Critical	9.8	44%	-	Fix
CVE-2023-38146	High	8.8	39%	-	Fix
CVE-2024-0132	Critical	9.0	37%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-04-15.